Re: [patch] drm/amdgpu: potential NULL dereference in debugfs code

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Am 12.10.2016 um 08:17 schrieb Dan Carpenter:
debugfs_create_file() returns NULL on error, it only returns error
pointers if debugfs isn't enabled in the config and we checked for that
earlier so it can't happen.

Fixes: 4f4824b55650 ('drm/amd/amdgpu: Convert ring debugfs entries to binary')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>.


diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 85aeb0a..8d16eaf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -371,8 +371,8 @@ static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
  	ent = debugfs_create_file(name,
  				  S_IFREG | S_IRUGO, root,
  				  ring, &amdgpu_debugfs_ring_fops);
-	if (IS_ERR(ent))
-		return PTR_ERR(ent);
+	if (!ent)
+		return -ENOMEM;
i_size_write(ent->d_inode, ring->ring_size + 12);
  	ring->ent = ent;


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